D defs.my
Entry 2 senses Webster, 1913

Tracing

/trās'-ĭng/ · Tra·cing · IPA /ˈtɹeɪsɪŋ/
01 n. The act of one who traces; especially, the act of copying by marking on thin paper, or other transparent substance, the lines of a pattern …
  1. 1.
    The act of one who traces; especially, the act of copying by marking on thin paper, or other transparent substance, the lines of a pattern placed beneath; also, the copy thus producted.
  2. 2.
    A regular path or track; a course.
Phrases & compounds
Tracing cloth — specially prepared transparent cloth or paper, which enables a drawing or print to be clearly seen through it, and so allows the use of a pen or pencil to produce a facsimile by following the lines of the original placed beneath.